Abort if earlygetopt fails to detect an option.
Otherwise it could happen that a command is used on the wrong repository,
because abbreviations of --cwd or --repository were ignored.
#!/bin/sh
# test parents command
hg init a
cd a
echo % no working directory
hg parents
echo a > a
echo b > b
hg ci -Amab -d '0 0'
echo a >> a
hg ci -Ama -d '1 0'
echo b >> b
hg ci -Amb -d '2 0'
echo % hg parents
hg parents
echo % hg parents a
hg parents a
echo % hg parents -r 2
hg parents -r 2
echo % hg parents -r 2 a
hg parents -r 2 a